ClassesClasses | | Operators

draw_polygondraw_polygonDrawPolygonDrawPolygon (Operator)

Name

draw_polygondraw_polygonDrawPolygonDrawPolygon — Interactive drawing of a polygon row.

Signature

draw_polygon( : PolygonRegion : WindowHandle : )

Herror draw_polygon(Hobject* PolygonRegion, const Hlong WindowHandle)

Herror T_draw_polygon(Hobject* PolygonRegion, const Htuple WindowHandle)

void DrawPolygon(HObject* PolygonRegion, const HTuple& WindowHandle)

void HRegion::DrawPolygon(const HWindow& WindowHandle)

HRegion HWindow::DrawPolygon() const

static void HOperatorSet.DrawPolygon(out HObject polygonRegion, HTuple windowHandle)

void HRegion.DrawPolygon(HWindow windowHandle)

HRegion HWindow.DrawPolygon()

Description

draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygon produces an image. The region of that image spans exactly the image points entered interactively by mouse clicks (gray values remain undefined).

Painting in the output window happens while pressing the left mouse button. Releasing the left mouse button and repressing it at another position effects drawing a line between these two points. Pressing the right mouse button terminates the input. On macOS draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygon can also be terminated by pressing the escape key. Painting uses that color which has been set by set_colorset_colorSetColorSetColorSetColor, set_rgbset_rgbSetRgbSetRgbSetRgb, etc. .

To put gray values on the created PolygonRegionPolygonRegionPolygonRegionPolygonRegionpolygonRegion for further processing, you may use the operator reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain.

Attention

The painted contour is not closed automatically, in particular it is not “filled up” either.

Output object's gray values are not defined.

Execution Information

Parameters

PolygonRegionPolygonRegionPolygonRegionPolygonRegionpolygonRegion (output_object)  region objectHRegionHRegionHobject *

Region, which encompasses all painted points.

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle (input_control)  window HWindow, HTupleHTupleHtuple (integer) (IntPtr) (Hlong) (Hlong)

Window handle.

Example (HDevelop)

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

Example (C)

draw_polygon(&Polygon,WindowHandle) ;
shape_trans(Polygon,&Filled,"convex") ;
disp_region(Filled,WindowHandle) ;

Example (HDevelop)

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

Example (HDevelop)

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

Example (HDevelop)

draw_polygon(Polygon,WindowHandle)
shape_trans(Polygon,Filled,'convex')
dev_display (Filled)

Result

If the window is valid, draw_polygondraw_polygonDrawPolygonDrawPolygonDrawPolygon returns 2 (H_MSG_TRUE). If necessary, an exception is raised.

Possible Predecessors

open_windowopen_windowOpenWindowOpenWindowOpenWindow

Possible Successors

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, disp_regiondisp_regionDispRegionDispRegionDispRegion, set_coloredset_coloredSetColoredSetColoredSetColored, set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidth, set_drawset_drawSetDrawSetDrawSetDraw

Alternatives

draw_regiondraw_regionDrawRegionDrawRegionDrawRegion, draw_circledraw_circleDrawCircleDrawCircleDrawCircle, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2, boundaryboundaryBoundaryBoundaryBoundary

See also

reduce_domainreduce_domainReduceDomainReduceDomainReduceDomain, fill_upfill_upFillUpFillUpFillUp, set_colorset_colorSetColorSetColorSetColor

Module

Foundation


ClassesClasses | | Operators